Marquez wins six-straight Texas MotoGP

Honda's reigning MotoGP world champion Marc Marquez ran away with the Grand Prix of the Americas for the sixth year in a row to take his first victory of the season in dominant fashion.

The 25-year-old Spaniard was handed a three-place grid penalty in qualifying and started fourth but seized the lead on the opening lap before disappearing into the distance at Austin's Circuit of the Americas (COTA).

It was the four-times MotoGP champion's 10th successive win in the United States in the top category, with the others coming at Laguna Seca and Indianapolis.

"My strategy was just start, push and that's it," said Marquez, who shrugged off boos from the crowd reacting to a champion whose on-track clashes with rivals have been a talking point of the season.

"I didn't have confidence to battle so I was pushing from the beginning and just go away, open the gap...in Spain they will be happy."

Maverick Vinales, who started on pole for Yamaha, finished second behind his compatriot while Italian Andrea Iannone was third in his first podium with Suzuki.

Andrea Dovizioso finished fifth for Ducati and regained the championship lead with 46 points after three races, the Italian now one clear of Marquez with Vinales third on 41.

Britain's Cal Crutchlow, who had led the standings after winning in Argentina, crashed with 12 laps to go and finished 19th.

Marquez had a lonely race, challenged only briefly before pulling clear to live up to his fame as "King of COTA".

"It's quite noisy, eh? But it's funny. Don't worry," he said of the crowd's reaction.

In Argentina, Marquez and Italian great Valentino Rossi collided with the Yamaha rider accusing the champion of "destroying" MotoGP by what he considered dangerous behaviour on track.

"I'm scared on the track when I'm with Marquez," Rossi had said.

Marquez did himself no favours in Saturday's qualifying either, crashing before returning on a spare bike and then picking up the grid penalty for blocking Vinales who was on a hot lap.